Dihexa
An orally active, brain-penetrant peptide derived from Angiotensin IV. People run it for memory and learning, for mental clarity, and for cognitive recovery, often as the heavy hitter in a nootropic stack with Semax and Selank.
Where to buy Dihexa, cheapest first.
The one vetted vendor we found currently listing Dihexa. We link straight to its product page and grade it on public lab data. As more vendors list it, they’ll show up here, cheapest first.
Dihexa
What Dihexa actually does.
The simple version first, then a little more for the curious. No biochem degree required.
It is studied for helping the brain build new connections between neurons by boosting a natural growth-factor signal, which is the kind of rewiring that underlies learning and memory.
How it works
Dihexa is an analog of Angiotensin IV. It is studied for binding hepatocyte growth factor (HGF) and potentiating its activity at the c-Met receptor, a pathway tied to the growth of new synapses, the connections that let neurons talk to each other.
Where it acts
Unusually for a peptide, it is small and lipophilic enough to be taken orally and cross the blood-brain barrier. Research has focused on the hippocampus, the brain region central to forming new memories.
What people notice
In community reports people describe sharper recall, easier learning, and clearer thinking that tends to build over days to weeks rather than hitting like a stimulant. Reports are anecdotal, not trial data.
Honest caveat: almost all of this comes from animal and lab studies, and the evidence base took a real hit when a key 2014 mechanistic paper was retracted for data fabrication. There are no completed human trials, no established human dose, and no long-term safety data. It is not an approved medicine and is sold strictly for research use only. None of this is medical advice, talk to a licensed provider before starting anything.
How to take it.
Dihexa is taken orally, as a capsule or under the tongue, with no needles and no injecting. The powder does not dissolve in water, so sublingual users typically work from a vendor solution or a DMSO-based prep. The routine is below; for cycling and stacking, see the full guide.
Take your dose
A common range is 8 to 45 mg once daily, with many people sitting around 10 to 20 mg. Swallow the capsule, or hold an oral solution under the tongue for 60 to 90 seconds before swallowing.
Timing
Most people dose once in the morning, since it is studied for focus and learning during the day. It can be taken with or without food. Pick a time and keep it consistent.
Stay consistent
Effects are described as building over days to weeks, not minutes. Run it daily through your cycle rather than dosing only when you feel like it.
Store it
Keep the sealed powder cool, dry, and out of direct light. A solubilized or sublingual prep is best kept refrigerated and used within a few weeks.
Typical Dihexa dose: roughly 8 to 45 mg once daily, with many people landing around 10 to 20 mg. It is run in cycles of about 8 to 12 weeks, then a break, rather than continuously.
How to cycle Dihexa.
How long people run Dihexa, when to take a break, and the honest reasoning behind it.
Run in cycles, not continuously.
A cycle just means a defined run of time on the peptide, followed by a break. For Dihexa the common pattern is about 8 to 12 weeks on, then time off, rather than running it indefinitely.
Why not just run it forever? Mostly because the long-term human safety data does not exist, and because a compound that powerfully rewires neural connections is exactly the kind of thing you do not want to run blind for months on end. The cautious approach is a focused block, then a break.
- Hold a steady daily dose through your cycle rather than chasing a bigger number.
- Take a real break after a cycle of 8 to 12 weeks before considering another.
- Watch how you actually feel, and stop if anything seems off. With evidence this thin, your own caution is the main safeguard.
Want the full picture, on and off periods, the washout, stacking, and keeping your results? Read how peptide cycling works →
What's actually in the vial.
For one of these vendors we link the per-batch certificate itself, and the purity below is read straight off it. The rest link to the vendor's general lab-results page. We don't run the labs ourselves and we don't show a purity number unless it's printed on a certificate we link, so you can open the document and check it against the batch yourself.
| Vendor | Purity (per COA) | Batch / report | Certificate |
|---|---|---|---|
| Umbrella Labs | 99.8% | ULP-48971 | View COA ↗ |
What people pair it with.
Dihexa is often run as the synaptogenic anchor of a cognitive stack. These are the combinations the nootropic community reaches for when the goal is sharper thinking.
Memory & clarity
The classic nootropic trio. Semax pushes BDNF and NGF, Selank smooths anxiety and mood, and Dihexa is run for the synapse-building piece. Three different angles on cognition in one protocol.
View stack →Drive & learning
A leaner combination for people who mainly want focus and learning without the anxiolytic layer. Semax for daily drive and neurotrophic support, Dihexa for the longer-build synaptic angle.
View stack →Mood & recall
Pairs Dihexa's memory angle with Selank's calmer, anti-anxiety profile. People reach for this when stress is getting in the way of clear thinking as much as raw cognition is.
View stack →In the same corner.
Other cognitive and nootropic peptides people compare against Dihexa.
Questions, answered straight.
Is Dihexa legal?
Dihexa is not an approved drug, and it is not sold for human use. The vendors we compare offer it strictly for research use only. It also falls under WADA's S0 non-approved-substances category, prohibited at all times, so competing athletes should steer clear. Rules vary by country, so check what applies where you are.
What does research use only actually mean?
It means the product is sold for laboratory and research purposes, not as a supplement or medicine for people. It has not been reviewed or approved for human use by the FDA. We aggregate prices and public lab data so you can see the landscape; what you do with that is between you and a licensed provider.
Do I inject Dihexa?
No. Dihexa is one of the rare peptides that is orally active and crosses the blood-brain barrier, so people take it by mouth, either swallowed as a capsule or held under the tongue as an oral solution. There is no reconstitution into bacteriostatic water and no injecting involved.
How do I store it?
Keep the sealed powder cool, dry, and out of direct light. Because Dihexa does not dissolve in water, any solubilized or sublingual prep is usually made with DMSO and should be refrigerated and used within a few weeks.
How long until it works?
People describe effects building over days to weeks rather than hitting like a stimulant. Many run a full cycle of 8 to 12 weeks before judging it. Keep in mind the human evidence is essentially absent, so treat reports as anecdotal.